Wiring up my 250ex

[dgarnier]

First, NEVER, NEVER, connect ground to neutral at an appliance. Never use neutral for ground and never use ground for neutral. The only time you need a neutral is when you need 110. 110 is either leg connected to neutral. 220 is one 110 leg connected to the other. Driers and stoves use the neutral for clocks, timers, control pads, etc. The 220 is for the heating elements. The welder only uses 220 and ground.

Edit to add: Read the first post. The red wire on your welder is NOT for residential use. It is only for 3 phase power. The Black and White on your cord are for your 110 volt legs; green is always ground.

Machine BLACK to wall BLACK
Machine WHITE to wall RED
Machine GREEN to wall BARE (GREEN)
Machine RED and wall WHITE are not used.

ok now things are starting to add up in my head...so you could hook up a single phase 220 welder with just 2 hot wires and then tie the ground wire from the welder to the box/conduit? If this is the case, and I dont trust the box/conduit as a ground and I want to run a ground wire would it have the be the same gauge as the 2 hot wires(6awg)? or could I use a 10awg for the ground wire?